Dalton Adding-Calculating Machine

Dalton Adding-Calculating Machine

A piece of true history of mechanical calculators – according to the "bible" of mechanical calculators (Die Rechenmaschinen by Ernst Martin, 1925), Dalton was the first to introduce the 10-key keyboard to its adding machines in 1902.

Current machine is both motor and manually operated. It stands on an original tubular steel stand. Is is manufactured in the 1920s in Cincinnati, Ohio, U.S.A. The machine has a brown painted metal case with ten white, plastic number keys, arranged in two rows. Operator keys are made of brown plastic. Digits and operations are marked on the keys. The machine has an operation select switch (MANUAL/MOTOR) – it can be operated manually with a crank or with electric motor.

The machine is equipped with an original 120 V electric motor made by The Robbins & Myers Co., Springfield, Ohio, U.S.A. The motor is fitted to work in European 220 V mains voltage, adjustments made in Finland by Vallilan Sähkö Oy in the 1920s.

The stand has original metallic wheels with a lever to lift the machine to roll on wheels, or lower it to stand on the floor. The stand also has a side table, that can be folded down or fixed to horizontal working position. The side table has an operating manual printed on it.

This machine is a rare collector's piece. It's in pristine condition. It's in working condition (tested both in manual and motor mode).

The machine has been imported to Europe by Dalton's Finnish dealer, Oy Konttoritarpeita, Helsinki / Ab Kontorsartiklar, Helsingfors.

Dimensions of the stand 54,5 (W) x 49 (D) x 67 (H) cm.
Machine dimensions 34,1 (W) x 36 (D) x 31 (H) cm.

Year of manufacture: 1919 ca

Serial №: 3-109262